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1983 944 sudden rough idle and stumble

Engine

Vehicle Information: Model(924/944): 944; Year: 1983; Engine (type, size, modifications): Original engine, no modifications; Total Mileage: 76,000;

Car was driving fine. I went into a conveniencestore for ten minutes, and when I came back, itstarted up, but idled rough (up and down), and wouldn't rev over 2K under load. If I gave more throttle, it stumbled and occasionally misfired. Faint smell of burning plastic under the hood. Temperature guage normal, MPG guage pegged to theleft.

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